diff --git a/AUTHORS b/AUTHORS
index d1b0945..eeb0549 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -27,6 +27,8 @@
 interception machinery, support for client allocation pools, and minor
 other tweakage.
 
+Josef Weidendorfer wrote Callgrind and the associated KCachegrind GUI.
+
 Frederic Gobry helped with autoconf and automake.
 
 Daniel Berlin modified readelf's dwarf2 source line reader, written by Nick